Take the kids to Xiyuan Wharf for some fresh air and sunshine. They'll have a ball trying to find fish swimming in the waters below or boats drifting in the distance.
You'll want to have your camera handy when you're visiting this waterside attraction. It draws many travelers who come to Hangzhou. Also worthy of a few photos is Shijatang Park. Conveniently near Xiyuan Wharf, it's another of this area's big drawcards.